The original ZOO studios were on the WFAA AM & FM floor, which was indeed super insulated against vibration. However, The ZOO broadcast from an extremely small studio including an antiquated General Electric console that sounded terrible. We constantly fought to overcome a terrible audio chain & transmitter that was controlled by uncaring TV engineers. I recall once talking to a sympathetic new director of corporate engineering and told him to go home, tune in KNUS 99 and then try to find the little FM station to the left. That was our 100,000 class C signal that totally sucked.
Eventually the ZOO signal was cleaned up, but it took many years.